Late Quaternary Mediterranean sapropels. III: Assessment of source of input and palaeotemperature as derived from biological markers

Details Late Quaternary Mediterranean sapropels. III: Assessment of source of input and palaeotemperature as derived from biological markers Late Quaternary Mediterranean sapropels. III: Assessment of source of input and palaeotemperature as derived from biological markers

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..803t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 4, pp.803-810

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Sources of input contributing to the organic matter of four different Mediterranean sapropels (S 1 , S 5 , S 6 , S 7 ) are inferred from the relative distributions of terrigenous and marine biological markers in these Quaternary deposits. The relative terrigenous contribution does not vary significantly. Within the marine contribution there is a significant compositional variation. A contribution from dinoflagellates is relatively important in the S 1 sapropel, whereas sapropels S 6 and S 7 are characterized by a relatively large contribution from prymnesiophyte algae and planktonic cyanobacteria. The abundance of diatoms in sapropel S 5 , as deduced from microscopic observations, is probably reflected by a high concentration of loliolide. Variations in sea-surface water temperatures can be deduced from the relative abundance of di- and triunsaturated C 37 ketones (U k 37 index) and from the relative abundance of esterified 27-nor-24-methylcholesta-5,22E-dien-3 -ol and cholesta-5,22E-dien-3 -ol (S TI index). These two molecular temperature indices are consistent with the 18 O record and with the pollen record of the sapropels investigated.

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